3. Wrap up the Roman numeral:

(C)(X)M(X)DCCIX is a group of numerals in additive and subtractive notation.

Subtractive notation = a group of two numerals, one of a lower value preceding another larger one, the only allowed ones are: IV, IX, XL, XC, CD, CM, M(V), M(X), (X)(L), (X)(C), (C)(D), (C)(M) - to calculate the value subtract the first symbol from the second. Subtractive notation of the Roman numerals Additive notation = a group of two or more numerals, equal or sorted in descending order from high to low - to calculate the value add up the symbols. Additive notation of the Roman numerals

Final answer:

How to write the Arabic number using Roman numerals: 119,709? 119,709 = (C)(X)M(X)DCCIX

(*) At the beginning Romans did not use numbers larger than 3,999; as a result they had no symbols in their system for these larger numbers, they were added on later and for them various different notations were used, not necessarily the ones we've just seen above.

Thus, initially, the largest number that could be written using Roman numerals was: